Logrus Formatter per output?

[UnAfraid]

Hello,

I wanted to set TextFormatter for stdout and JsonFormatter for file output, is that possible?

Here's my logger initialization

func initLogger() {
	if debug {
		logrus.SetLevel(logrus.DebugLevel)
	}

	logrus.SetFormatter(&logrus.TextFormatter{
		ForceColors:     true, // Seems like automatic color detection doesn't work on windows terminals
		FullTimestamp:   true,
		TimestampFormat: time.RFC822,
	})

	multiWriter := io.MultiWriter(colorable.NewColorableStdout(), &lumberjack.Logger{
		Filename:   "logs/console.log",
		MaxSize:    50, // megabytes
		MaxBackups: 3,
		MaxAge:     28,   //days
		Compress:   true, // disabled by default
	})

	logrus.SetOutput(multiWriter)
}

I am logging into Stdout and log file
The problem is that it output color chars are getting inside the file as well..

�[36mINFO�[0m[04 Jul 18 17:12 EEST] Initializing

[UnAfraid]

Solved by using hooks:

func initLogger() {
	var logLevel = logrus.InfoLevel
	if debug {
		logLevel = logrus.DebugLevel
	}

	rotateFileHook, err := rotatefilehook.NewRotateFileHook(rotatefilehook.RotateFileConfig{
		Filename:   "logs/console.log",
		MaxSize:    50, // megabytes
		MaxBackups: 3,
		MaxAge:     28, //days
		Level:      logLevel,
		Formatter: &logrus.JSONFormatter{
			TimestampFormat: time.RFC822,
		},
	})

	if err != nil {
		logrus.Fatalf("Failed to initialize file rotate hook: %v", err)
	}

	logrus.SetLevel(logLevel)
	logrus.SetOutput(colorable.NewColorableStdout())
	logrus.SetFormatter(&logrus.TextFormatter{
		ForceColors:     true,
		FullTimestamp:   true,
		TimestampFormat: time.RFC822,
	})
	logrus.AddHook(rotateFileHook)
}

[david0u0]

Thanks for the solution, but I find it somewhat overkilling to add another dependency (lumberjack) just to solve a simple problem, namely writing logs to file in different format. Can we consider re-open this issue? thanks

[utdrmac]

@UnAfraid How do you have two different outputs/formatters using vanilla logrus?

[UnAfraid]

@UnAfraid How do you have two different outputs/formatters using vanilla logrus?

By using hook, either existing one or implement your own

[stevekuznetsov]

Agree this should be re-opened, having a trivial way to configure a formatter for the built-in hooks is a must.

[tatulea]

Yes, it would be very useful and trivial

[dimtass]

Had the same issue and it's indeed trivial. The maintainer though on the README mentions that no new functionality is going to be implemented, therefore I guess the only solution is either use hooks or another logger.

[mem-]

Solved by using hooks:

func initLogger() {
	var logLevel = logrus.InfoLevel
	if debug {
		logLevel = logrus.DebugLevel
	}

	rotateFileHook, err := rotatefilehook.NewRotateFileHook(rotatefilehook.RotateFileConfig{
		Filename:   "logs/console.log",
  .
  .
  .
  .
}

I based my idea on this and came up with a version that doesn't use RotateFileHook,
see #894 (comment)